net/core/rtnetlink.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Routing netlink socket interface: protocol independent part.
   7  *
   8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      Fixes:
  16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
  17  */
  18
  19 #include <linux/errno.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/socket.h>
  23 #include <linux/kernel.h>
  24 #include <linux/timer.h>
  25 #include <linux/string.h>
  26 #include <linux/sockios.h>
  27 #include <linux/net.h>
  28 #include <linux/fcntl.h>
  29 #include <linux/mm.h>
  30 #include <linux/slab.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/capability.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/init.h>
  35 #include <linux/security.h>
  36 #include <linux/mutex.h>
  37 #include <linux/if_addr.h>
  38 #include <linux/if_bridge.h>
  39 #include <linux/if_vlan.h>
  40 #include <linux/pci.h>
  41 #include <linux/etherdevice.h>
  42
  43 #include <asm/uaccess.h>
  44
  45 #include <linux/inet.h>
  46 #include <linux/netdevice.h>
  47 #include <net/switchdev.h>
  48 #include <net/ip.h>
  49 #include <net/protocol.h>
  50 #include <net/arp.h>
  51 #include <net/route.h>
  52 #include <net/udp.h>
  53 #include <net/tcp.h>
  54 #include <net/sock.h>
  55 #include <net/pkt_sched.h>
  56 #include <net/fib_rules.h>
  57 #include <net/rtnetlink.h>
  58 #include <net/net_namespace.h>
  59
  60 struct rtnl_link {
  61         rtnl_doit_func          doit;
  62         rtnl_dumpit_func        dumpit;
  63         rtnl_calcit_func        calcit;
  64 };
  65
  66 static DEFINE_MUTEX(rtnl_mutex);
  67
  68 void rtnl_lock(void)
  69 {
  70         mutex_lock(&rtnl_mutex);
  71 }
  72 EXPORT_SYMBOL(rtnl_lock);
  73
  74 void __rtnl_unlock(void)
  75 {
  76         mutex_unlock(&rtnl_mutex);
  77 }
  78
  79 void rtnl_unlock(void)
  80 {
  81         /* This fellow will unlock it for us. */
  82         netdev_run_todo();
  83 }
  84 EXPORT_SYMBOL(rtnl_unlock);
  85
  86 int rtnl_trylock(void)
  87 {
  88         return mutex_trylock(&rtnl_mutex);
  89 }
  90 EXPORT_SYMBOL(rtnl_trylock);
  91
  92 int rtnl_is_locked(void)
  93 {
  94         return mutex_is_locked(&rtnl_mutex);
  95 }
  96 EXPORT_SYMBOL(rtnl_is_locked);
  97
  98 #ifdef CONFIG_PROVE_LOCKING
  99 int lockdep_rtnl_is_held(void)
 100 {
 101         return lockdep_is_held(&rtnl_mutex);
 102 }
 103 EXPORT_SYMBOL(lockdep_rtnl_is_held);
 104 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 105
 106 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 107
 108 static inline int rtm_msgindex(int msgtype)
 109 {
 110         int msgindex = msgtype - RTM_BASE;
 111
 112         /*
 113          * msgindex < 0 implies someone tried to register a netlink
 114          * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 115          * the message type has not been added to linux/rtnetlink.h
 116          */
 117         BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 118
 119         return msgindex;
 120 }
 121
 122 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
 123 {
 124         struct rtnl_link *tab;
 125
 126         if (protocol <= RTNL_FAMILY_MAX)
 127                 tab = rtnl_msg_handlers[protocol];
 128         else
 129                 tab = NULL;
 130
 131         if (tab == NULL || tab[msgindex].doit == NULL)
 132                 tab = rtnl_msg_handlers[PF_UNSPEC];
 133
 134         return tab[msgindex].doit;
 135 }
 136
 137 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
 138 {
 139         struct rtnl_link *tab;
 140
 141         if (protocol <= RTNL_FAMILY_MAX)
 142                 tab = rtnl_msg_handlers[protocol];
 143         else
 144                 tab = NULL;
 145
 146         if (tab == NULL || tab[msgindex].dumpit == NULL)
 147                 tab = rtnl_msg_handlers[PF_UNSPEC];
 148
 149         return tab[msgindex].dumpit;
 150 }
 151
 152 static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
 153 {
 154         struct rtnl_link *tab;
 155
 156         if (protocol <= RTNL_FAMILY_MAX)
 157                 tab = rtnl_msg_handlers[protocol];
 158         else
 159                 tab = NULL;
 160
 161         if (tab == NULL || tab[msgindex].calcit == NULL)
 162                 tab = rtnl_msg_handlers[PF_UNSPEC];
 163
 164         return tab[msgindex].calcit;
 165 }
 166
 167 /**
 168  * __rtnl_register - Register a rtnetlink message type
 169  * @protocol: Protocol family or PF_UNSPEC
 170  * @msgtype: rtnetlink message type
 171  * @doit: Function pointer called for each request message
 172  * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 173  * @calcit: Function pointer to calc size of dump message
 174  *
 175  * Registers the specified function pointers (at least one of them has
 176  * to be non-NULL) to be called whenever a request message for the
 177  * specified protocol family and message type is received.
 178  *
 179  * The special protocol family PF_UNSPEC may be used to define fallback
 180  * function pointers for the case when no entry for the specific protocol
 181  * family exists.
 182  *
 183  * Returns 0 on success or a negative error code.
 184  */
 185 int __rtnl_register(int protocol, int msgtype,
 186                     rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 187                     rtnl_calcit_func calcit)
 188 {
 189         struct rtnl_link *tab;
 190         int msgindex;
 191
 192         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 193         msgindex = rtm_msgindex(msgtype);
 194
 195         tab = rtnl_msg_handlers[protocol];
 196         if (tab == NULL) {
 197                 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
 198                 if (tab == NULL)
 199                         return -ENOBUFS;
 200
 201                 rtnl_msg_handlers[protocol] = tab;
 202         }
 203
 204         if (doit)
 205                 tab[msgindex].doit = doit;
 206
 207         if (dumpit)
 208                 tab[msgindex].dumpit = dumpit;
 209
 210         if (calcit)
 211                 tab[msgindex].calcit = calcit;
 212
 213         return 0;
 214 }
 215 EXPORT_SYMBOL_GPL(__rtnl_register);
 216
 217 /**
 218  * rtnl_register - Register a rtnetlink message type
 219  *
 220  * Identical to __rtnl_register() but panics on failure. This is useful
 221  * as failure of this function is very unlikely, it can only happen due
 222  * to lack of memory when allocating the chain to store all message
 223  * handlers for a protocol. Meant for use in init functions where lack
 224  * of memory implies no sense in continuing.
 225  */
 226 void rtnl_register(int protocol, int msgtype,
 227                    rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 228                    rtnl_calcit_func calcit)
 229 {
 230         if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
 231                 panic("Unable to register rtnetlink message handler, "
 232                       "protocol = %d, message type = %d\n",
 233                       protocol, msgtype);
 234 }
 235 EXPORT_SYMBOL_GPL(rtnl_register);
 236
 237 /**
 238  * rtnl_unregister - Unregister a rtnetlink message type
 239  * @protocol: Protocol family or PF_UNSPEC
 240  * @msgtype: rtnetlink message type
 241  *
 242  * Returns 0 on success or a negative error code.
 243  */
 244 int rtnl_unregister(int protocol, int msgtype)
 245 {
 246         int msgindex;
 247
 248         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 249         msgindex = rtm_msgindex(msgtype);
 250
 251         if (rtnl_msg_handlers[protocol] == NULL)
 252                 return -ENOENT;
 253
 254         rtnl_msg_handlers[protocol][msgindex].doit = NULL;
 255         rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
 256
 257         return 0;
 258 }
 259 EXPORT_SYMBOL_GPL(rtnl_unregister);
 260
 261 /**
 262  * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 263  * @protocol : Protocol family or PF_UNSPEC
 264  *
 265  * Identical to calling rtnl_unregster() for all registered message types
 266  * of a certain protocol family.
 267  */
 268 void rtnl_unregister_all(int protocol)
 269 {
 270         BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 271
 272         kfree(rtnl_msg_handlers[protocol]);
 273         rtnl_msg_handlers[protocol] = NULL;
 274 }
 275 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 276
 277 static LIST_HEAD(link_ops);
 278
 279 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 280 {
 281         const struct rtnl_link_ops *ops;
 282
 283         list_for_each_entry(ops, &link_ops, list) {
 284                 if (!strcmp(ops->kind, kind))
 285                         return ops;
 286         }
 287         return NULL;
 288 }
 289
 290 /**
 291  * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 292  * @ops: struct rtnl_link_ops * to register
 293  *
 294  * The caller must hold the rtnl_mutex. This function should be used
 295  * by drivers that create devices during module initialization. It
 296  * must be called before registering the devices.
 297  *
 298  * Returns 0 on success or a negative error code.
 299  */
 300 int __rtnl_link_register(struct rtnl_link_ops *ops)
 301 {
 302         if (rtnl_link_ops_get(ops->kind))
 303                 return -EEXIST;
 304
 305         /* The check for setup is here because if ops
 306          * does not have that filled up, it is not possible
 307          * to use the ops for creating device. So do not
 308          * fill up dellink as well. That disables rtnl_dellink.
 309          */
 310         if (ops->setup && !ops->dellink)
 311                 ops->dellink = unregister_netdevice_queue;
 312
 313         list_add_tail(&ops->list, &link_ops);
 314         return 0;
 315 }
 316 EXPORT_SYMBOL_GPL(__rtnl_link_register);
 317
 318 /**
 319  * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 320  * @ops: struct rtnl_link_ops * to register
 321  *
 322  * Returns 0 on success or a negative error code.
 323  */
 324 int rtnl_link_register(struct rtnl_link_ops *ops)
 325 {
 326         int err;
 327
 328         rtnl_lock();
 329         err = __rtnl_link_register(ops);
 330         rtnl_unlock();
 331         return err;
 332 }
 333 EXPORT_SYMBOL_GPL(rtnl_link_register);
 334
 335 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 336 {
 337         struct net_device *dev;
 338         LIST_HEAD(list_kill);
 339
 340         for_each_netdev(net, dev) {
 341                 if (dev->rtnl_link_ops == ops)
 342                         ops->dellink(dev, &list_kill);
 343         }
 344         unregister_netdevice_many(&list_kill);
 345 }
 346
 347 /**
 348  * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 349  * @ops: struct rtnl_link_ops * to unregister
 350  *
 351  * The caller must hold the rtnl_mutex.
 352  */
 353 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 354 {
 355         struct net *net;
 356
 357         for_each_net(net) {
 358                 __rtnl_kill_links(net, ops);
 359         }
 360         list_del(&ops->list);
 361 }
 362 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 363
 364 /* Return with the rtnl_lock held when there are no network
 365  * devices unregistering in any network namespace.
 366  */
 367 static void rtnl_lock_unregistering_all(void)
 368 {
 369         struct net *net;
 370         bool unregistering;
 371         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 372
 373         add_wait_queue(&netdev_unregistering_wq, &wait);
 374         for (;;) {
 375                 unregistering = false;
 376                 rtnl_lock();
 377                 for_each_net(net) {
 378                         if (net->dev_unreg_count > 0) {
 379                                 unregistering = true;
 380                                 break;
 381                         }
 382                 }
 383                 if (!unregistering)
 384                         break;
 385                 __rtnl_unlock();
 386
 387                 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 388         }
 389         remove_wait_queue(&netdev_unregistering_wq, &wait);
 390 }
 391
 392 /**
 393  * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 394  * @ops: struct rtnl_link_ops * to unregister
 395  */
 396 void rtnl_link_unregister(struct rtnl_link_ops *ops)
 397 {
 398         /* Close the race with cleanup_net() */
 399         mutex_lock(&net_mutex);
 400         rtnl_lock_unregistering_all();
 401         __rtnl_link_unregister(ops);
 402         rtnl_unlock();
 403         mutex_unlock(&net_mutex);
 404 }
 405 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 406
 407 static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 408 {
 409         struct net_device *master_dev;
 410         const struct rtnl_link_ops *ops;
 411
 412         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 413         if (!master_dev)
 414                 return 0;
 415         ops = master_dev->rtnl_link_ops;
 416         if (!ops || !ops->get_slave_size)
 417                 return 0;
 418         /* IFLA_INFO_SLAVE_DATA + nested data */
 419         return nla_total_size(sizeof(struct nlattr)) +
 420                ops->get_slave_size(master_dev, dev);
 421 }
 422
 423 static size_t rtnl_link_get_size(const struct net_device *dev)
 424 {
 425         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 426         size_t size;
 427
 428         if (!ops)
 429                 return 0;
 430
 431         size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 432                nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 433
 434         if (ops->get_size)
 435                 /* IFLA_INFO_DATA + nested data */
 436                 size += nla_total_size(sizeof(struct nlattr)) +
 437                         ops->get_size(dev);
 438
 439         if (ops->get_xstats_size)
 440                 /* IFLA_INFO_XSTATS */
 441                 size += nla_total_size(ops->get_xstats_size(dev));
 442
 443         size += rtnl_link_get_slave_info_data_size(dev);
 444
 445         return size;
 446 }
 447
 448 static LIST_HEAD(rtnl_af_ops);
 449
 450 static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 451 {
 452         const struct rtnl_af_ops *ops;
 453
 454         list_for_each_entry(ops, &rtnl_af_ops, list) {
 455                 if (ops->family == family)
 456                         return ops;
 457         }
 458
 459         return NULL;
 460 }
 461
 462 /**
 463  * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 464  * @ops: struct rtnl_af_ops * to register
 465  *
 466  * Returns 0 on success or a negative error code.
 467  */
 468 void rtnl_af_register(struct rtnl_af_ops *ops)
 469 {
 470         rtnl_lock();
 471         list_add_tail(&ops->list, &rtnl_af_ops);
 472         rtnl_unlock();
 473 }
 474 EXPORT_SYMBOL_GPL(rtnl_af_register);
 475
 476 /**
 477  * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 478  * @ops: struct rtnl_af_ops * to unregister
 479  *
 480  * The caller must hold the rtnl_mutex.
 481  */
 482 void __rtnl_af_unregister(struct rtnl_af_ops *ops)
 483 {
 484         list_del(&ops->list);
 485 }
 486 EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
 487
 488 /**
 489  * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 490  * @ops: struct rtnl_af_ops * to unregister
 491  */
 492 void rtnl_af_unregister(struct rtnl_af_ops *ops)
 493 {
 494         rtnl_lock();
 495         __rtnl_af_unregister(ops);
 496         rtnl_unlock();
 497 }
 498 EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 499
 500 static size_t rtnl_link_get_af_size(const struct net_device *dev)
 501 {
 502         struct rtnl_af_ops *af_ops;
 503         size_t size;
 504
 505         /* IFLA_AF_SPEC */
 506         size = nla_total_size(sizeof(struct nlattr));
 507
 508         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
 509                 if (af_ops->get_link_af_size) {
 510                         /* AF_* + nested data */
 511                         size += nla_total_size(sizeof(struct nlattr)) +
 512                                 af_ops->get_link_af_size(dev);
 513                 }
 514         }
 515
 516         return size;
 517 }
 518
 519 static bool rtnl_have_link_slave_info(const struct net_device *dev)
 520 {
 521         struct net_device *master_dev;
 522
 523         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 524         if (master_dev && master_dev->rtnl_link_ops)
 525                 return true;
 526         return false;
 527 }
 528
 529 static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 530                                      const struct net_device *dev)
 531 {
 532         struct net_device *master_dev;
 533         const struct rtnl_link_ops *ops;
 534         struct nlattr *slave_data;
 535         int err;
 536
 537         master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 538         if (!master_dev)
 539                 return 0;
 540         ops = master_dev->rtnl_link_ops;
 541         if (!ops)
 542                 return 0;
 543         if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 544                 return -EMSGSIZE;
 545         if (ops->fill_slave_info) {
 546                 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
 547                 if (!slave_data)
 548                         return -EMSGSIZE;
 549                 err = ops->fill_slave_info(skb, master_dev, dev);
 550                 if (err < 0)
 551                         goto err_cancel_slave_data;
 552                 nla_nest_end(skb, slave_data);
 553         }
 554         return 0;
 555
 556 err_cancel_slave_data:
 557         nla_nest_cancel(skb, slave_data);
 558         return err;
 559 }
 560
 561 static int rtnl_link_info_fill(struct sk_buff *skb,
 562                                const struct net_device *dev)
 563 {
 564         const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 565         struct nlattr *data;
 566         int err;
 567
 568         if (!ops)
 569                 return 0;
 570         if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 571                 return -EMSGSIZE;
 572         if (ops->fill_xstats) {
 573                 err = ops->fill_xstats(skb, dev);
 574                 if (err < 0)
 575                         return err;
 576         }
 577         if (ops->fill_info) {
 578                 data = nla_nest_start(skb, IFLA_INFO_DATA);
 579                 if (data == NULL)
 580                         return -EMSGSIZE;
 581                 err = ops->fill_info(skb, dev);
 582                 if (err < 0)
 583                         goto err_cancel_data;
 584                 nla_nest_end(skb, data);
 585         }
 586         return 0;
 587
 588 err_cancel_data:
 589         nla_nest_cancel(skb, data);
 590         return err;
 591 }
 592
 593 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 594 {
 595         struct nlattr *linkinfo;
 596         int err = -EMSGSIZE;
 597
 598         linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
 599         if (linkinfo == NULL)
 600                 goto out;
 601
 602         err = rtnl_link_info_fill(skb, dev);
 603         if (err < 0)
 604                 goto err_cancel_link;
 605
 606         err = rtnl_link_slave_info_fill(skb, dev);
 607         if (err < 0)
 608                 goto err_cancel_link;
 609
 610         nla_nest_end(skb, linkinfo);
 611         return 0;
 612
 613 err_cancel_link:
 614         nla_nest_cancel(skb, linkinfo);
 615 out:
 616         return err;
 617 }
 618
 619 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 620 {
 621         struct sock *rtnl = net->rtnl;
 622         int err = 0;
 623
 624         NETLINK_CB(skb).dst_group = group;
 625         if (echo)
 626                 atomic_inc(&skb->users);
 627         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 628         if (echo)
 629                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 630         return err;
 631 }
 632
 633 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 634 {
 635         struct sock *rtnl = net->rtnl;
 636
 637         return nlmsg_unicast(rtnl, skb, pid);
 638 }
 639 EXPORT_SYMBOL(rtnl_unicast);
 640
 641 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 642                  struct nlmsghdr *nlh, gfp_t flags)
 643 {
 644         struct sock *rtnl = net->rtnl;
 645         int report = 0;
 646
 647         if (nlh)
 648                 report = nlmsg_report(nlh);
 649
 650         nlmsg_notify(rtnl, skb, pid, group, report, flags);
 651 }
 652 EXPORT_SYMBOL(rtnl_notify);
 653
 654 void rtnl_set_sk_err(struct net *net, u32 group, int error)
 655 {
 656         struct sock *rtnl = net->rtnl;
 657
 658         netlink_set_err(rtnl, 0, group, error);
 659 }
 660 EXPORT_SYMBOL(rtnl_set_sk_err);
 661
 662 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 663 {
 664         struct nlattr *mx;
 665         int i, valid = 0;
 666
 667         mx = nla_nest_start(skb, RTA_METRICS);
 668         if (mx == NULL)
 669                 return -ENOBUFS;
 670
 671         for (i = 0; i < RTAX_MAX; i++) {
 672                 if (metrics[i]) {
 673                         if (i == RTAX_CC_ALGO - 1) {
 674                                 char tmp[TCP_CA_NAME_MAX], *name;
 675
 676                                 name = tcp_ca_get_name_by_key(metrics[i], tmp);
 677                                 if (!name)
 678                                         continue;
 679                                 if (nla_put_string(skb, i + 1, name))
 680                                         goto nla_put_failure;
 681                         } else {
 682                                 if (nla_put_u32(skb, i + 1, metrics[i]))
 683                                         goto nla_put_failure;
 684                         }
 685                         valid++;
 686                 }
 687         }
 688
 689         if (!valid) {
 690                 nla_nest_cancel(skb, mx);
 691                 return 0;
 692         }
 693
 694         return nla_nest_end(skb, mx);
 695
 696 nla_put_failure:
 697         nla_nest_cancel(skb, mx);
 698         return -EMSGSIZE;
 699 }
 700 EXPORT_SYMBOL(rtnetlink_put_metrics);
 701
 702 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 703                        long expires, u32 error)
 704 {
 705         struct rta_cacheinfo ci = {
 706                 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
 707                 .rta_used = dst->__use,
 708                 .rta_clntref = atomic_read(&(dst->__refcnt)),
 709                 .rta_error = error,
 710                 .rta_id =  id,
 711         };
 712
 713         if (expires) {
 714                 unsigned long clock;
 715
 716                 clock = jiffies_to_clock_t(abs(expires));
 717                 clock = min_t(unsigned long, clock, INT_MAX);
 718                 ci.rta_expires = (expires > 0) ? clock : -clock;
 719         }
 720         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 721 }
 722 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 723
 724 static void set_operstate(struct net_device *dev, unsigned char transition)
 725 {
 726         unsigned char operstate = dev->operstate;
 727
 728         switch (transition) {
 729         case IF_OPER_UP:
 730                 if ((operstate == IF_OPER_DORMANT ||
 731                      operstate == IF_OPER_UNKNOWN) &&
 732                     !netif_dormant(dev))
 733                         operstate = IF_OPER_UP;
 734                 break;
 735
 736         case IF_OPER_DORMANT:
 737                 if (operstate == IF_OPER_UP ||
 738                     operstate == IF_OPER_UNKNOWN)
 739                         operstate = IF_OPER_DORMANT;
 740                 break;
 741         }
 742
 743         if (dev->operstate != operstate) {
 744                 write_lock_bh(&dev_base_lock);
 745                 dev->operstate = operstate;
 746                 write_unlock_bh(&dev_base_lock);
 747                 netdev_state_change(dev);
 748         }
 749 }
 750
 751 static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 752 {
 753         return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 754                (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 755 }
 756
 757 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 758                                            const struct ifinfomsg *ifm)
 759 {
 760         unsigned int flags = ifm->ifi_flags;
 761
 762         /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 763         if (ifm->ifi_change)
 764                 flags = (flags & ifm->ifi_change) |
 765                         (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 766
 767         return flags;
 768 }
 769
 770 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 771                                  const struct rtnl_link_stats64 *b)
 772 {
 773         a->rx_packets = b->rx_packets;
 774         a->tx_packets = b->tx_packets;
 775         a->rx_bytes = b->rx_bytes;
 776         a->tx_bytes = b->tx_bytes;
 777         a->rx_errors = b->rx_errors;
 778         a->tx_errors = b->tx_errors;
 779         a->rx_dropped = b->rx_dropped;
 780         a->tx_dropped = b->tx_dropped;
 781
 782         a->multicast = b->multicast;
 783         a->collisions = b->collisions;
 784
 785         a->rx_length_errors = b->rx_length_errors;
 786         a->rx_over_errors = b->rx_over_errors;
 787         a->rx_crc_errors = b->rx_crc_errors;
 788         a->rx_frame_errors = b->rx_frame_errors;
 789         a->rx_fifo_errors = b->rx_fifo_errors;
 790         a->rx_missed_errors = b->rx_missed_errors;
 791
 792         a->tx_aborted_errors = b->tx_aborted_errors;
 793         a->tx_carrier_errors = b->tx_carrier_errors;
 794         a->tx_fifo_errors = b->tx_fifo_errors;
 795         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 796         a->tx_window_errors = b->tx_window_errors;
 797
 798         a->rx_compressed = b->rx_compressed;
 799         a->tx_compressed = b->tx_compressed;
 800 }
 801
 802 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
 803 {
 804         memcpy(v, b, sizeof(*b));
 805 }
 806
 807 /* All VF info */
 808 static inline int rtnl_vfinfo_size(const struct net_device *dev,
 809                                    u32 ext_filter_mask)
 810 {
 811         if (dev->dev.parent && dev_is_pci(dev->dev.parent) &&
 812             (ext_filter_mask & RTEXT_FILTER_VF)) {
 813                 int num_vfs = dev_num_vf(dev->dev.parent);
 814                 size_t size = nla_total_size(sizeof(struct nlattr));
 815                 size += nla_total_size(num_vfs * sizeof(struct nlattr));
 816                 size += num_vfs *
 817                         (nla_total_size(sizeof(struct ifla_vf_mac)) +
 818                          nla_total_size(sizeof(struct ifla_vf_vlan)) +
 819                          nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 820                          nla_total_size(sizeof(struct ifla_vf_rate)) +
 821                          nla_total_size(sizeof(struct ifla_vf_link_state)));
 822                 return size;
 823         } else
 824                 return 0;
 825 }
 826
 827 static size_t rtnl_port_size(const struct net_device *dev,
 828                              u32 ext_filter_mask)
 829 {
 830         size_t port_size = nla_total_size(4)            /* PORT_VF */
 831                 + nla_total_size(PORT_PROFILE_MAX)      /* PORT_PROFILE */
 832                 + nla_total_size(sizeof(struct ifla_port_vsi))
 833                                                         /* PORT_VSI_TYPE */
 834                 + nla_total_size(PORT_UUID_MAX)         /* PORT_INSTANCE_UUID */
 835                 + nla_total_size(PORT_UUID_MAX)         /* PORT_HOST_UUID */
 836                 + nla_total_size(1)                     /* PROT_VDP_REQUEST */
 837                 + nla_total_size(2);                    /* PORT_VDP_RESPONSE */
 838         size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 839         size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 840                 + port_size;
 841         size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 842                 + port_size;
 843
 844         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 845             !(ext_filter_mask & RTEXT_FILTER_VF))
 846                 return 0;
 847         if (dev_num_vf(dev->dev.parent))
 848                 return port_self_size + vf_ports_size +
 849                         vf_port_size * dev_num_vf(dev->dev.parent);
 850         else
 851                 return port_self_size;
 852 }
 853
 854 static noinline size_t if_nlmsg_size(const struct net_device *dev,
 855                                      u32 ext_filter_mask)
 856 {
 857         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 858                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 859                + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
 860                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
 861                + nla_total_size(sizeof(struct rtnl_link_ifmap))
 862                + nla_total_size(sizeof(struct rtnl_link_stats))
 863                + nla_total_size(sizeof(struct rtnl_link_stats64))
 864                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 865                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
 866                + nla_total_size(4) /* IFLA_TXQLEN */
 867                + nla_total_size(4) /* IFLA_WEIGHT */
 868                + nla_total_size(4) /* IFLA_MTU */
 869                + nla_total_size(4) /* IFLA_LINK */
 870                + nla_total_size(4) /* IFLA_MASTER */
 871                + nla_total_size(1) /* IFLA_CARRIER */
 872                + nla_total_size(4) /* IFLA_PROMISCUITY */
 873                + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
 874                + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
 875                + nla_total_size(1) /* IFLA_OPERSTATE */
 876                + nla_total_size(1) /* IFLA_LINKMODE */
 877                + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
 878                + nla_total_size(4) /* IFLA_LINK_NETNSID */
 879                + nla_total_size(ext_filter_mask
 880                                 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
 881                + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
 882                + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
 883                + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 884                + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
 885                + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 886                + nla_total_size(MAX_PHYS_ITEM_ID_LEN); /* IFLA_PHYS_SWITCH_ID */
 887 }
 888
 889 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 890 {
 891         struct nlattr *vf_ports;
 892         struct nlattr *vf_port;
 893         int vf;
 894         int err;
 895
 896         vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
 897         if (!vf_ports)
 898                 return -EMSGSIZE;
 899
 900         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
 901                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
 902                 if (!vf_port)
 903                         goto nla_put_failure;
 904                 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
 905                         goto nla_put_failure;
 906                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
 907                 if (err == -EMSGSIZE)
 908                         goto nla_put_failure;
 909                 if (err) {
 910                         nla_nest_cancel(skb, vf_port);
 911                         continue;
 912                 }
 913                 nla_nest_end(skb, vf_port);
 914         }
 915
 916         nla_nest_end(skb, vf_ports);
 917
 918         return 0;
 919
 920 nla_put_failure:
 921         nla_nest_cancel(skb, vf_ports);
 922         return -EMSGSIZE;
 923 }
 924
 925 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
 926 {
 927         struct nlattr *port_self;
 928         int err;
 929
 930         port_self = nla_nest_start(skb, IFLA_PORT_SELF);
 931         if (!port_self)
 932                 return -EMSGSIZE;
 933
 934         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
 935         if (err) {
 936                 nla_nest_cancel(skb, port_self);
 937                 return (err == -EMSGSIZE) ? err : 0;
 938         }
 939
 940         nla_nest_end(skb, port_self);
 941
 942         return 0;
 943 }
 944
 945 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
 946                           u32 ext_filter_mask)
 947 {
 948         int err;
 949
 950         if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 951             !(ext_filter_mask & RTEXT_FILTER_VF))
 952                 return 0;
 953
 954         err = rtnl_port_self_fill(skb, dev);
 955         if (err)
 956                 return err;
 957
 958         if (dev_num_vf(dev->dev.parent)) {
 959                 err = rtnl_vf_ports_fill(skb, dev);
 960                 if (err)
 961                         return err;
 962         }
 963
 964         return 0;
 965 }
 966
 967 static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
 968 {
 969         int err;
 970         struct netdev_phys_item_id ppid;
 971
 972         err = dev_get_phys_port_id(dev, &ppid);
 973         if (err) {
 974                 if (err == -EOPNOTSUPP)
 975                         return 0;
 976                 return err;
 977         }
 978
 979         if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
 980                 return -EMSGSIZE;
 981
 982         return 0;
 983 }
 984
 985 static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
 986 {
 987         char name[IFNAMSIZ];
 988         int err;
 989
 990         err = dev_get_phys_port_name(dev, name, sizeof(name));
 991         if (err) {
 992                 if (err == -EOPNOTSUPP)
 993                         return 0;
 994                 return err;
 995         }
 996
 997         if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
 998                 return -EMSGSIZE;
 999
1000         return 0;
1001 }
1002
1003 static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1004 {
1005         int err;
1006         struct netdev_phys_item_id psid;
1007
1008         err = netdev_switch_parent_id_get(dev, &psid);
1009         if (err) {
1010                 if (err == -EOPNOTSUPP)
1011                         return 0;
1012                 return err;
1013         }
1014
1015         if (nla_put(skb, IFLA_PHYS_SWITCH_ID, psid.id_len, psid.id))
1016                 return -EMSGSIZE;
1017
1018         return 0;
1019 }
1020
1021 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
1022                             int type, u32 pid, u32 seq, u32 change,
1023                             unsigned int flags, u32 ext_filter_mask)
1024 {
1025         struct ifinfomsg *ifm;
1026         struct nlmsghdr *nlh;
1027         struct rtnl_link_stats64 temp;
1028         const struct rtnl_link_stats64 *stats;
1029         struct nlattr *attr, *af_spec;
1030         struct rtnl_af_ops *af_ops;
1031         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1032
1033         ASSERT_RTNL();
1034         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1035         if (nlh == NULL)
1036                 return -EMSGSIZE;
1037
1038         ifm = nlmsg_data(nlh);
1039         ifm->ifi_family = AF_UNSPEC;
1040         ifm->__ifi_pad = 0;
1041         ifm->ifi_type = dev->type;
1042         ifm->ifi_index = dev->ifindex;
1043         ifm->ifi_flags = dev_get_flags(dev);
1044         ifm->ifi_change = change;
1045
1046         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1047             nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1048             nla_put_u8(skb, IFLA_OPERSTATE,
1049                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1050             nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1051             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1052             nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1053             nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1054             nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1055 #ifdef CONFIG_RPS
1056             nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1057 #endif
1058             (dev->ifindex != dev_get_iflink(dev) &&
1059              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
1060             (upper_dev &&
1061              nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex)) ||
1062             nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1063             (dev->qdisc &&
1064              nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1065             (dev->ifalias &&
1066              nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
1067             nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1068                         atomic_read(&dev->carrier_changes)))
1069                 goto nla_put_failure;
1070
1071         if (1) {
1072                 struct rtnl_link_ifmap map = {
1073                         .mem_start   = dev->mem_start,
1074                         .mem_end     = dev->mem_end,
1075                         .base_addr   = dev->base_addr,
1076                         .irq         = dev->irq,
1077                         .dma         = dev->dma,
1078                         .port        = dev->if_port,
1079                 };
1080                 if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
1081                         goto nla_put_failure;
1082         }
1083
1084         if (dev->addr_len) {
1085                 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1086                     nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1087                         goto nla_put_failure;
1088         }
1089
1090         if (rtnl_phys_port_id_fill(skb, dev))
1091                 goto nla_put_failure;
1092
1093         if (rtnl_phys_port_name_fill(skb, dev))
1094                 goto nla_put_failure;
1095
1096         if (rtnl_phys_switch_id_fill(skb, dev))
1097                 goto nla_put_failure;
1098
1099         attr = nla_reserve(skb, IFLA_STATS,
1100                         sizeof(struct rtnl_link_stats));
1101         if (attr == NULL)
1102                 goto nla_put_failure;
1103
1104         stats = dev_get_stats(dev, &temp);
1105         copy_rtnl_link_stats(nla_data(attr), stats);
1106
1107         attr = nla_reserve(skb, IFLA_STATS64,
1108                         sizeof(struct rtnl_link_stats64));
1109         if (attr == NULL)
1110                 goto nla_put_failure;
1111         copy_rtnl_link_stats64(nla_data(attr), stats);
1112
1113         if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF) &&
1114             nla_put_u32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent)))
1115                 goto nla_put_failure;
1116
1117         if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent
1118             && (ext_filter_mask & RTEXT_FILTER_VF)) {
1119                 int i;
1120
1121                 struct nlattr *vfinfo, *vf;
1122                 int num_vfs = dev_num_vf(dev->dev.parent);
1123
1124                 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1125                 if (!vfinfo)
1126                         goto nla_put_failure;
1127                 for (i = 0; i < num_vfs; i++) {
1128                         struct ifla_vf_info ivi;
1129                         struct ifla_vf_mac vf_mac;
1130                         struct ifla_vf_vlan vf_vlan;
1131                         struct ifla_vf_rate vf_rate;
1132                         struct ifla_vf_tx_rate vf_tx_rate;
1133                         struct ifla_vf_spoofchk vf_spoofchk;
1134                         struct ifla_vf_link_state vf_linkstate;
1135
1136                         /*
1137                          * Not all SR-IOV capable drivers support the
1138                          * spoofcheck query.  Preset to -1 so the user
1139                          * space tool can detect that the driver didn't
1140                          * report anything.
1141                          */
1142                         ivi.spoofchk = -1;
1143                         memset(ivi.mac, 0, sizeof(ivi.mac));
1144                         /* The default value for VF link state is "auto"
1145                          * IFLA_VF_LINK_STATE_AUTO which equals zero
1146                          */
1147                         ivi.linkstate = 0;
1148                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
1149                                 break;
1150                         vf_mac.vf =
1151                                 vf_vlan.vf =
1152                                 vf_rate.vf =
1153                                 vf_tx_rate.vf =
1154                                 vf_spoofchk.vf =
1155                                 vf_linkstate.vf = ivi.vf;
1156
1157                         memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1158                         vf_vlan.vlan = ivi.vlan;
1159                         vf_vlan.qos = ivi.qos;
1160                         vf_tx_rate.rate = ivi.max_tx_rate;
1161                         vf_rate.min_tx_rate = ivi.min_tx_rate;
1162                         vf_rate.max_tx_rate = ivi.max_tx_rate;
1163                         vf_spoofchk.setting = ivi.spoofchk;
1164                         vf_linkstate.link_state = ivi.linkstate;
1165                         vf = nla_nest_start(skb, IFLA_VF_INFO);
1166                         if (!vf) {
1167                                 nla_nest_cancel(skb, vfinfo);
1168                                 goto nla_put_failure;
1169                         }
1170                         if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1171                             nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1172                             nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1173                                     &vf_rate) ||
1174                             nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1175                                     &vf_tx_rate) ||
1176                             nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1177                                     &vf_spoofchk) ||
1178                             nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1179                                     &vf_linkstate))
1180                                 goto nla_put_failure;
1181                         nla_nest_end(skb, vf);
1182                 }
1183                 nla_nest_end(skb, vfinfo);
1184         }
1185
1186         if (rtnl_port_fill(skb, dev, ext_filter_mask))
1187                 goto nla_put_failure;
1188
1189         if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1190                 if (rtnl_link_fill(skb, dev) < 0)
1191                         goto nla_put_failure;
1192         }
1193
1194         if (dev->rtnl_link_ops &&
1195             dev->rtnl_link_ops->get_link_net) {
1196                 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1197
1198                 if (!net_eq(dev_net(dev), link_net)) {
1199                         int id = peernet2id(dev_net(dev), link_net);
1200
1201                         if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1202                                 goto nla_put_failure;
1203                 }
1204         }
1205
1206         if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
1207                 goto nla_put_failure;
1208
1209         list_for_each_entry(af_ops, &rtnl_af_ops, list) {
1210                 if (af_ops->fill_link_af) {
1211                         struct nlattr *af;
1212                         int err;
1213
1214                         if (!(af = nla_nest_start(skb, af_ops->family)))
1215                                 goto nla_put_failure;
1216
1217                         err = af_ops->fill_link_af(skb, dev);
1218
1219                         /*
1220                          * Caller may return ENODATA to indicate that there
1221                          * was no data to be dumped. This is not an error, it
1222                          * means we should trim the attribute header and
1223                          * continue.
1224                          */
1225                         if (err == -ENODATA)
1226                                 nla_nest_cancel(skb, af);
1227                         else if (err < 0)
1228                                 goto nla_put_failure;
1229
1230                         nla_nest_end(skb, af);
1231                 }
1232         }
1233
1234         nla_nest_end(skb, af_spec);
1235
1236         nlmsg_end(skb, nlh);
1237         return 0;
1238
1239 nla_put_failure:
1240         nlmsg_cancel(skb, nlh);
1241         return -EMSGSIZE;
1242 }
1243
1244 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1245         [IFLA_IFNAME]           = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1246         [IFLA_ADDRESS]          = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1247         [IFLA_BROADCAST]        = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1248         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
1249         [IFLA_MTU]              = { .type = NLA_U32 },
1250         [IFLA_LINK]             = { .type = NLA_U32 },
1251         [IFLA_MASTER]           = { .type = NLA_U32 },
1252         [IFLA_CARRIER]          = { .type = NLA_U8 },
1253         [IFLA_TXQLEN]           = { .type = NLA_U32 },
1254         [IFLA_WEIGHT]           = { .type = NLA_U32 },
1255         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
1256         [IFLA_LINKMODE]         = { .type = NLA_U8 },
1257         [IFLA_LINKINFO]         = { .type = NLA_NESTED },
1258         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
1259         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
1260         [IFLA_IFALIAS]          = { .type = NLA_STRING, .len = IFALIASZ-1 },
1261         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED },
1262         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
1263         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
1264         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
1265         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
1266         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
1267         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
1268         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
1269         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1270         [IFLA_CARRIER_CHANGES]  = { .type = NLA_U32 },  /* ignored */
1271         [IFLA_PHYS_SWITCH_ID]   = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1272         [IFLA_LINK_NETNSID]     = { .type = NLA_S32 },
1273 };
1274
1275 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1276         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
1277         [IFLA_INFO_DATA]        = { .type = NLA_NESTED },
1278         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
1279         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
1280 };
1281
1282 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1283         [IFLA_VF_INFO]          = { .type = NLA_NESTED },
1284 };
1285
1286 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1287         [IFLA_VF_MAC]           = { .len = sizeof(struct ifla_vf_mac) },
1288         [IFLA_VF_VLAN]          = { .len = sizeof(struct ifla_vf_vlan) },
1289         [IFLA_VF_TX_RATE]       = { .len = sizeof(struct ifla_vf_tx_rate) },
1290         [IFLA_VF_SPOOFCHK]      = { .len = sizeof(struct ifla_vf_spoofchk) },
1291         [IFLA_VF_RATE]          = { .len = sizeof(struct ifla_vf_rate) },
1292         [IFLA_VF_LINK_STATE]    = { .len = sizeof(struct ifla_vf_link_state) },
1293 };
1294
1295 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1296         [IFLA_PORT_VF]          = { .type = NLA_U32 },
1297         [IFLA_PORT_PROFILE]     = { .type = NLA_STRING,
1298                                     .len = PORT_PROFILE_MAX },
1299         [IFLA_PORT_VSI_TYPE]    = { .type = NLA_BINARY,
1300                                     .len = sizeof(struct ifla_port_vsi)},
1301         [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1302                                       .len = PORT_UUID_MAX },
1303         [IFLA_PORT_HOST_UUID]   = { .type = NLA_STRING,
1304                                     .len = PORT_UUID_MAX },
1305         [IFLA_PORT_REQUEST]     = { .type = NLA_U8, },
1306         [IFLA_PORT_RESPONSE]    = { .type = NLA_U16, },
1307 };
1308
1309 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1310 {
1311         struct net *net = sock_net(skb->sk);
1312         int h, s_h;
1313         int idx = 0, s_idx;
1314         struct net_device *dev;
1315         struct hlist_head *head;
1316         struct nlattr *tb[IFLA_MAX+1];
1317         u32 ext_filter_mask = 0;
1318         int err;
1319         int hdrlen;
1320
1321         s_h = cb->args[0];
1322         s_idx = cb->args[1];
1323
1324         cb->seq = net->dev_base_seq;
1325
1326         /* A hack to preserve kernel<->userspace interface.
1327          * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1328          * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1329          * what iproute2 < v3.9.0 used.
1330          * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1331          * attribute, its netlink message is shorter than struct ifinfomsg.
1332          */
1333         hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1334                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1335
1336         if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
1337
1338                 if (tb[IFLA_EXT_MASK])
1339                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1340         }
1341
1342         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1343                 idx = 0;
1344                 head = &net->dev_index_head[h];
1345                 hlist_for_each_entry(dev, head, index_hlist) {
1346                         if (idx < s_idx)
1347                                 goto cont;
1348                         err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1349                                                NETLINK_CB(cb->skb).portid,
1350                                                cb->nlh->nlmsg_seq, 0,
1351                                                NLM_F_MULTI,
1352                                                ext_filter_mask);
1353                         /* If we ran out of room on the first message,
1354                          * we're in trouble
1355                          */
1356                         WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
1357
1358                         if (err < 0)
1359                                 goto out;
1360
1361                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1362 cont:
1363                         idx++;
1364                 }
1365         }
1366 out:
1367         cb->args[1] = idx;
1368         cb->args[0] = h;
1369
1370         return skb->len;
1371 }
1372
1373 int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len)
1374 {
1375         return nla_parse(tb, IFLA_MAX, head, len, ifla_policy);
1376 }
1377 EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1378
1379 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1380 {
1381         struct net *net;
1382         /* Examine the link attributes and figure out which
1383          * network namespace we are talking about.
1384          */
1385         if (tb[IFLA_NET_NS_PID])
1386                 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1387         else if (tb[IFLA_NET_NS_FD])
1388                 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1389         else
1390                 net = get_net(src_net);
1391         return net;
1392 }
1393 EXPORT_SYMBOL(rtnl_link_get_net);
1394
1395 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1396 {
1397         if (dev) {
1398                 if (tb[IFLA_ADDRESS] &&
1399                     nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1400                         return -EINVAL;
1401
1402                 if (tb[IFLA_BROADCAST] &&
1403                     nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1404                         return -EINVAL;
1405         }
1406
1407         if (tb[IFLA_AF_SPEC]) {
1408                 struct nlattr *af;
1409                 int rem, err;
1410
1411                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1412                         const struct rtnl_af_ops *af_ops;
1413
1414                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1415                                 return -EAFNOSUPPORT;
1416
1417                         if (!af_ops->set_link_af)
1418                                 return -EOPNOTSUPP;
1419
1420                         if (af_ops->validate_link_af) {
1421                                 err = af_ops->validate_link_af(dev, af);
1422                                 if (err < 0)
1423                                         return err;
1424                         }
1425                 }
1426         }
1427
1428         return 0;
1429 }
1430
1431 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1432 {
1433         int rem, err = -EINVAL;
1434         struct nlattr *vf;
1435         const struct net_device_ops *ops = dev->netdev_ops;
1436
1437         nla_for_each_nested(vf, attr, rem) {
1438                 switch (nla_type(vf)) {
1439                 case IFLA_VF_MAC: {
1440                         struct ifla_vf_mac *ivm;
1441                         ivm = nla_data(vf);
1442                         err = -EOPNOTSUPP;
1443                         if (ops->ndo_set_vf_mac)
1444                                 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1445                                                           ivm->mac);
1446                         break;
1447                 }
1448                 case IFLA_VF_VLAN: {
1449                         struct ifla_vf_vlan *ivv;
1450                         ivv = nla_data(vf);
1451                         err = -EOPNOTSUPP;
1452                         if (ops->ndo_set_vf_vlan)
1453                                 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1454                                                            ivv->vlan,
1455                                                            ivv->qos);
1456                         break;
1457                 }
1458                 case IFLA_VF_TX_RATE: {
1459                         struct ifla_vf_tx_rate *ivt;
1460                         struct ifla_vf_info ivf;
1461                         ivt = nla_data(vf);
1462                         err = -EOPNOTSUPP;
1463                         if (ops->ndo_get_vf_config)
1464                                 err = ops->ndo_get_vf_config(dev, ivt->vf,
1465                                                              &ivf);
1466                         if (err)
1467                                 break;
1468                         err = -EOPNOTSUPP;
1469                         if (ops->ndo_set_vf_rate)
1470                                 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1471                                                            ivf.min_tx_rate,
1472                                                            ivt->rate);
1473                         break;
1474                 }
1475                 case IFLA_VF_RATE: {
1476                         struct ifla_vf_rate *ivt;
1477                         ivt = nla_data(vf);
1478                         err = -EOPNOTSUPP;
1479                         if (ops->ndo_set_vf_rate)
1480                                 err = ops->ndo_set_vf_rate(dev, ivt->vf,
1481                                                            ivt->min_tx_rate,
1482                                                            ivt->max_tx_rate);
1483                         break;
1484                 }
1485                 case IFLA_VF_SPOOFCHK: {
1486                         struct ifla_vf_spoofchk *ivs;
1487                         ivs = nla_data(vf);
1488                         err = -EOPNOTSUPP;
1489                         if (ops->ndo_set_vf_spoofchk)
1490                                 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
1491                                                                ivs->setting);
1492                         break;
1493                 }
1494                 case IFLA_VF_LINK_STATE: {
1495                         struct ifla_vf_link_state *ivl;
1496                         ivl = nla_data(vf);
1497                         err = -EOPNOTSUPP;
1498                         if (ops->ndo_set_vf_link_state)
1499                                 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
1500                                                                  ivl->link_state);
1501                         break;
1502                 }
1503                 default:
1504                         err = -EINVAL;
1505                         break;
1506                 }
1507                 if (err)
1508                         break;
1509         }
1510         return err;
1511 }
1512
1513 static int do_set_master(struct net_device *dev, int ifindex)
1514 {
1515         struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
1516         const struct net_device_ops *ops;
1517         int err;
1518
1519         if (upper_dev) {
1520                 if (upper_dev->ifindex == ifindex)
1521                         return 0;
1522                 ops = upper_dev->netdev_ops;
1523                 if (ops->ndo_del_slave) {
1524                         err = ops->ndo_del_slave(upper_dev, dev);
1525                         if (err)
1526                                 return err;
1527                 } else {
1528                         return -EOPNOTSUPP;
1529                 }
1530         }
1531
1532         if (ifindex) {
1533                 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
1534                 if (!upper_dev)
1535                         return -EINVAL;
1536                 ops = upper_dev->netdev_ops;
1537                 if (ops->ndo_add_slave) {
1538                         err = ops->ndo_add_slave(upper_dev, dev);
1539                         if (err)
1540                                 return err;
1541                 } else {
1542                         return -EOPNOTSUPP;
1543                 }
1544         }
1545         return 0;
1546 }
1547
1548 #define DO_SETLINK_MODIFIED     0x01
1549 /* notify flag means notify + modified. */
1550 #define DO_SETLINK_NOTIFY       0x03
1551 static int do_setlink(const struct sk_buff *skb,
1552                       struct net_device *dev, struct ifinfomsg *ifm,
1553                       struct nlattr **tb, char *ifname, int status)
1554 {
1555         const struct net_device_ops *ops = dev->netdev_ops;
1556         int err;
1557
1558         if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1559                 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1560                 if (IS_ERR(net)) {
1561                         err = PTR_ERR(net);
1562                         goto errout;
1563                 }
1564                 if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
1565                         put_net(net);
1566                         err = -EPERM;
1567                         goto errout;
1568                 }
1569                 err = dev_change_net_namespace(dev, net, ifname);
1570                 put_net(net);
1571                 if (err)
1572                         goto errout;
1573                 status |= DO_SETLINK_MODIFIED;
1574         }
1575
1576         if (tb[IFLA_MAP]) {
1577                 struct rtnl_link_ifmap *u_map;
1578                 struct ifmap k_map;
1579
1580                 if (!ops->ndo_set_config) {
1581                         err = -EOPNOTSUPP;
1582                         goto errout;
1583                 }
1584
1585                 if (!netif_device_present(dev)) {
1586                         err = -ENODEV;
1587                         goto errout;
1588                 }
1589
1590                 u_map = nla_data(tb[IFLA_MAP]);
1591                 k_map.mem_start = (unsigned long) u_map->mem_start;
1592                 k_map.mem_end = (unsigned long) u_map->mem_end;
1593                 k_map.base_addr = (unsigned short) u_map->base_addr;
1594                 k_map.irq = (unsigned char) u_map->irq;
1595                 k_map.dma = (unsigned char) u_map->dma;
1596                 k_map.port = (unsigned char) u_map->port;
1597
1598                 err = ops->ndo_set_config(dev, &k_map);
1599                 if (err < 0)
1600                         goto errout;
1601
1602                 status |= DO_SETLINK_NOTIFY;
1603         }
1604
1605         if (tb[IFLA_ADDRESS]) {
1606                 struct sockaddr *sa;
1607                 int len;
1608
1609                 len = sizeof(sa_family_t) + dev->addr_len;
1610                 sa = kmalloc(len, GFP_KERNEL);
1611                 if (!sa) {
1612                         err = -ENOMEM;
1613                         goto errout;
1614                 }
1615                 sa->sa_family = dev->type;
1616                 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1617                        dev->addr_len);
1618                 err = dev_set_mac_address(dev, sa);
1619                 kfree(sa);
1620                 if (err)
1621                         goto errout;
1622                 status |= DO_SETLINK_MODIFIED;
1623         }
1624
1625         if (tb[IFLA_MTU]) {
1626                 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1627                 if (err < 0)
1628                         goto errout;
1629                 status |= DO_SETLINK_MODIFIED;
1630         }
1631
1632         if (tb[IFLA_GROUP]) {
1633                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1634                 status |= DO_SETLINK_NOTIFY;
1635         }
1636
1637         /*
1638          * Interface selected by interface index but interface
1639          * name provided implies that a name change has been
1640          * requested.
1641          */
1642         if (ifm->ifi_index > 0 && ifname[0]) {
1643                 err = dev_change_name(dev, ifname);
1644                 if (err < 0)
1645                         goto errout;
1646                 status |= DO_SETLINK_MODIFIED;
1647         }
1648
1649         if (tb[IFLA_IFALIAS]) {
1650                 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1651                                     nla_len(tb[IFLA_IFALIAS]));
1652                 if (err < 0)
1653                         goto errout;
1654                 status |= DO_SETLINK_NOTIFY;
1655         }
1656
1657         if (tb[IFLA_BROADCAST]) {
1658                 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1659                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1660         }
1661
1662         if (ifm->ifi_flags || ifm->ifi_change) {
1663                 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1664                 if (err < 0)
1665                         goto errout;
1666         }
1667
1668         if (tb[IFLA_MASTER]) {
1669                 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1670                 if (err)
1671                         goto errout;
1672                 status |= DO_SETLINK_MODIFIED;
1673         }
1674
1675         if (tb[IFLA_CARRIER]) {
1676                 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
1677                 if (err)
1678                         goto errout;
1679                 status |= DO_SETLINK_MODIFIED;
1680         }
1681
1682         if (tb[IFLA_TXQLEN]) {
1683                 unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
1684
1685                 if (dev->tx_queue_len ^ value)
1686                         status |= DO_SETLINK_NOTIFY;
1687
1688                 dev->tx_queue_len = value;
1689         }
1690
1691         if (tb[IFLA_OPERSTATE])
1692                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1693
1694         if (tb[IFLA_LINKMODE]) {
1695                 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
1696
1697                 write_lock_bh(&dev_base_lock);
1698                 if (dev->link_mode ^ value)
1699                         status |= DO_SETLINK_NOTIFY;
1700                 dev->link_mode = value;
1701                 write_unlock_bh(&dev_base_lock);
1702         }
1703
1704         if (tb[IFLA_VFINFO_LIST]) {
1705                 struct nlattr *attr;
1706                 int rem;
1707                 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1708                         if (nla_type(attr) != IFLA_VF_INFO) {
1709                                 err = -EINVAL;
1710                                 goto errout;
1711                         }
1712                         err = do_setvfinfo(dev, attr);
1713                         if (err < 0)
1714                                 goto errout;
1715                         status |= DO_SETLINK_NOTIFY;
1716                 }
1717         }
1718         err = 0;
1719
1720         if (tb[IFLA_VF_PORTS]) {
1721                 struct nlattr *port[IFLA_PORT_MAX+1];
1722                 struct nlattr *attr;
1723                 int vf;
1724                 int rem;
1725
1726                 err = -EOPNOTSUPP;
1727                 if (!ops->ndo_set_vf_port)
1728                         goto errout;
1729
1730                 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1731                         if (nla_type(attr) != IFLA_VF_PORT)
1732                                 continue;
1733                         err = nla_parse_nested(port, IFLA_PORT_MAX,
1734                                 attr, ifla_port_policy);
1735                         if (err < 0)
1736                                 goto errout;
1737                         if (!port[IFLA_PORT_VF]) {
1738                                 err = -EOPNOTSUPP;
1739                                 goto errout;
1740                         }
1741                         vf = nla_get_u32(port[IFLA_PORT_VF]);
1742                         err = ops->ndo_set_vf_port(dev, vf, port);
1743                         if (err < 0)
1744                                 goto errout;
1745                         status |= DO_SETLINK_NOTIFY;
1746                 }
1747         }
1748         err = 0;
1749
1750         if (tb[IFLA_PORT_SELF]) {
1751                 struct nlattr *port[IFLA_PORT_MAX+1];
1752
1753                 err = nla_parse_nested(port, IFLA_PORT_MAX,
1754                         tb[IFLA_PORT_SELF], ifla_port_policy);
1755                 if (err < 0)
1756                         goto errout;
1757
1758                 err = -EOPNOTSUPP;
1759                 if (ops->ndo_set_vf_port)
1760                         err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1761                 if (err < 0)
1762                         goto errout;
1763                 status |= DO_SETLINK_NOTIFY;
1764         }
1765
1766         if (tb[IFLA_AF_SPEC]) {
1767                 struct nlattr *af;
1768                 int rem;
1769
1770                 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1771                         const struct rtnl_af_ops *af_ops;
1772
1773                         if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1774                                 BUG();
1775
1776                         err = af_ops->set_link_af(dev, af);
1777                         if (err < 0)
1778                                 goto errout;
1779
1780                         status |= DO_SETLINK_NOTIFY;
1781                 }
1782         }
1783         err = 0;
1784
1785 errout:
1786         if (status & DO_SETLINK_MODIFIED) {
1787                 if (status & DO_SETLINK_NOTIFY)
1788                         netdev_state_change(dev);
1789
1790                 if (err < 0)
1791                         net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n",
1792                                              dev->name);
1793         }
1794
1795         return err;
1796 }
1797
1798 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
1799 {
1800         struct net *net = sock_net(skb->sk);
1801         struct ifinfomsg *ifm;
1802         struct net_device *dev;
1803         int err;
1804         struct nlattr *tb[IFLA_MAX+1];
1805         char ifname[IFNAMSIZ];
1806
1807         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1808         if (err < 0)
1809                 goto errout;
1810
1811         if (tb[IFLA_IFNAME])
1812                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1813         else
1814                 ifname[0] = '\0';
1815
1816         err = -EINVAL;
1817         ifm = nlmsg_data(nlh);
1818         if (ifm->ifi_index > 0)
1819                 dev = __dev_get_by_index(net, ifm->ifi_index);
1820         else if (tb[IFLA_IFNAME])
1821                 dev = __dev_get_by_name(net, ifname);
1822         else
1823                 goto errout;
1824
1825         if (dev == NULL) {
1826                 err = -ENODEV;
1827                 goto errout;
1828         }
1829
1830         err = validate_linkmsg(dev, tb);
1831         if (err < 0)
1832                 goto errout;
1833
1834         err = do_setlink(skb, dev, ifm, tb, ifname, 0);
1835 errout:
1836         return err;
1837 }
1838
1839 static int rtnl_group_dellink(const struct net *net, int group)
1840 {
1841         struct net_device *dev, *aux;
1842         LIST_HEAD(list_kill);
1843         bool found = false;
1844
1845         if (!group)
1846                 return -EPERM;
1847
1848         for_each_netdev(net, dev) {
1849                 if (dev->group == group) {
1850                         const struct rtnl_link_ops *ops;
1851
1852                         found = true;
1853                         ops = dev->rtnl_link_ops;
1854                         if (!ops || !ops->dellink)
1855                                 return -EOPNOTSUPP;
1856                 }
1857         }
1858
1859         if (!found)
1860                 return -ENODEV;
1861
1862         for_each_netdev_safe(net, dev, aux) {
1863                 if (dev->group == group) {
1864                         const struct rtnl_link_ops *ops;
1865
1866                         ops = dev->rtnl_link_ops;
1867                         ops->dellink(dev, &list_kill);
1868                 }
1869         }
1870         unregister_netdevice_many(&list_kill);
1871
1872         return 0;
1873 }
1874
1875 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
1876 {
1877         struct net *net = sock_net(skb->sk);
1878         const struct rtnl_link_ops *ops;
1879         struct net_device *dev;
1880         struct ifinfomsg *ifm;
1881         char ifname[IFNAMSIZ];
1882         struct nlattr *tb[IFLA_MAX+1];
1883         int err;
1884         LIST_HEAD(list_kill);
1885
1886         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1887         if (err < 0)
1888                 return err;
1889
1890         if (tb[IFLA_IFNAME])
1891                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1892
1893         ifm = nlmsg_data(nlh);
1894         if (ifm->ifi_index > 0)
1895                 dev = __dev_get_by_index(net, ifm->ifi_index);
1896         else if (tb[IFLA_IFNAME])
1897                 dev = __dev_get_by_name(net, ifname);
1898         else if (tb[IFLA_GROUP])
1899                 return rtnl_group_dellink(net, nla_get_u32(tb[IFLA_GROUP]));
1900         else
1901                 return -EINVAL;
1902
1903         if (!dev)
1904                 return -ENODEV;
1905
1906         ops = dev->rtnl_link_ops;
1907         if (!ops || !ops->dellink)
1908                 return -EOPNOTSUPP;
1909
1910         ops->dellink(dev, &list_kill);
1911         unregister_netdevice_many(&list_kill);
1912         return 0;
1913 }
1914
1915 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1916 {
1917         unsigned int old_flags;
1918         int err;
1919
1920         old_flags = dev->flags;
1921         if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1922                 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1923                 if (err < 0)
1924                         return err;
1925         }
1926
1927         dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1928
1929         __dev_notify_flags(dev, old_flags, ~0U);
1930         return 0;
1931 }
1932 EXPORT_SYMBOL(rtnl_configure_link);
1933
1934 struct net_device *rtnl_create_link(struct net *net,
1935         char *ifname, unsigned char name_assign_type,
1936         const struct rtnl_link_ops *ops, struct nlattr *tb[])
1937 {
1938         int err;
1939         struct net_device *dev;
1940         unsigned int num_tx_queues = 1;
1941         unsigned int num_rx_queues = 1;
1942
1943         if (tb[IFLA_NUM_TX_QUEUES])
1944                 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
1945         else if (ops->get_num_tx_queues)
1946                 num_tx_queues = ops->get_num_tx_queues();
1947
1948         if (tb[IFLA_NUM_RX_QUEUES])
1949                 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
1950         else if (ops->get_num_rx_queues)
1951                 num_rx_queues = ops->get_num_rx_queues();
1952
1953         err = -ENOMEM;
1954         dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
1955                                ops->setup, num_tx_queues, num_rx_queues);
1956         if (!dev)
1957                 goto err;
1958
1959         dev_net_set(dev, net);
1960         dev->rtnl_link_ops = ops;
1961         dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1962
1963         if (tb[IFLA_MTU])
1964                 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1965         if (tb[IFLA_ADDRESS]) {
1966                 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1967                                 nla_len(tb[IFLA_ADDRESS]));
1968                 dev->addr_assign_type = NET_ADDR_SET;
1969         }
1970         if (tb[IFLA_BROADCAST])
1971                 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1972                                 nla_len(tb[IFLA_BROADCAST]));
1973         if (tb[IFLA_TXQLEN])
1974                 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1975         if (tb[IFLA_OPERSTATE])
1976                 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1977         if (tb[IFLA_LINKMODE])
1978                 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1979         if (tb[IFLA_GROUP])
1980                 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1981
1982         return dev;
1983
1984 err:
1985         return ERR_PTR(err);
1986 }
1987 EXPORT_SYMBOL(rtnl_create_link);
1988
1989 static int rtnl_group_changelink(const struct sk_buff *skb,
1990                 struct net *net, int group,
1991                 struct ifinfomsg *ifm,
1992                 struct nlattr **tb)
1993 {
1994         struct net_device *dev, *aux;
1995         int err;
1996
1997         for_each_netdev_safe(net, dev, aux) {
1998                 if (dev->group == group) {
1999                         err = do_setlink(skb, dev, ifm, tb, NULL, 0);
2000                         if (err < 0)
2001                                 return err;
2002                 }
2003         }
2004
2005         return 0;
2006 }
2007
2008 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
2009 {
2010         struct net *net = sock_net(skb->sk);
2011         const struct rtnl_link_ops *ops;
2012         const struct rtnl_link_ops *m_ops = NULL;
2013         struct net_device *dev;
2014         struct net_device *master_dev = NULL;
2015         struct ifinfomsg *ifm;
2016         char kind[MODULE_NAME_LEN];
2017         char ifname[IFNAMSIZ];
2018         struct nlattr *tb[IFLA_MAX+1];
2019         struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2020         unsigned char name_assign_type = NET_NAME_USER;
2021         int err;
2022
2023 #ifdef CONFIG_MODULES
2024 replay:
2025 #endif
2026         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2027         if (err < 0)
2028                 return err;
2029
2030         if (tb[IFLA_IFNAME])
2031                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2032         else
2033                 ifname[0] = '\0';
2034
2035         ifm = nlmsg_data(nlh);
2036         if (ifm->ifi_index > 0)
2037                 dev = __dev_get_by_index(net, ifm->ifi_index);
2038         else {
2039                 if (ifname[0])
2040                         dev = __dev_get_by_name(net, ifname);
2041                 else
2042                         dev = NULL;
2043         }
2044
2045         if (dev) {
2046                 master_dev = netdev_master_upper_dev_get(dev);
2047                 if (master_dev)
2048                         m_ops = master_dev->rtnl_link_ops;
2049         }
2050
2051         err = validate_linkmsg(dev, tb);
2052         if (err < 0)
2053                 return err;
2054
2055         if (tb[IFLA_LINKINFO]) {
2056                 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2057                                        tb[IFLA_LINKINFO], ifla_info_policy);
2058                 if (err < 0)
2059                         return err;
2060         } else
2061                 memset(linkinfo, 0, sizeof(linkinfo));
2062
2063         if (linkinfo[IFLA_INFO_KIND]) {
2064                 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2065                 ops = rtnl_link_ops_get(kind);
2066         } else {
2067                 kind[0] = '\0';
2068                 ops = NULL;
2069         }
2070
2071         if (1) {
2072                 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2073                 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2074                 struct nlattr **data = NULL;
2075                 struct nlattr **slave_data = NULL;
2076                 struct net *dest_net, *link_net = NULL;
2077
2078                 if (ops) {
2079                         if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2080                                 err = nla_parse_nested(attr, ops->maxtype,
2081                                                        linkinfo[IFLA_INFO_DATA],
2082                                                        ops->policy);
2083                                 if (err < 0)
2084                                         return err;
2085                                 data = attr;
2086                         }
2087                         if (ops->validate) {
2088                                 err = ops->validate(tb, data);
2089                                 if (err < 0)
2090                                         return err;
2091                         }
2092                 }
2093
2094                 if (m_ops) {
2095                         if (m_ops->slave_maxtype &&
2096                             linkinfo[IFLA_INFO_SLAVE_DATA]) {
2097                                 err = nla_parse_nested(slave_attr,
2098                                                        m_ops->slave_maxtype,
2099                                                        linkinfo[IFLA_INFO_SLAVE_DATA],
2100                                                        m_ops->slave_policy);
2101                                 if (err < 0)
2102                                         return err;
2103                                 slave_data = slave_attr;
2104                         }
2105                         if (m_ops->slave_validate) {
2106                                 err = m_ops->slave_validate(tb, slave_data);
2107                                 if (err < 0)
2108                                         return err;
2109                         }
2110                 }
2111
2112                 if (dev) {
2113                         int status = 0;
2114
2115                         if (nlh->nlmsg_flags & NLM_F_EXCL)
2116                                 return -EEXIST;
2117                         if (nlh->nlmsg_flags & NLM_F_REPLACE)
2118                                 return -EOPNOTSUPP;
2119
2120                         if (linkinfo[IFLA_INFO_DATA]) {
2121                                 if (!ops || ops != dev->rtnl_link_ops ||
2122                                     !ops->changelink)
2123                                         return -EOPNOTSUPP;
2124
2125                                 err = ops->changelink(dev, tb, data);
2126                                 if (err < 0)
2127                                         return err;
2128                                 status |= DO_SETLINK_NOTIFY;
2129                         }
2130
2131                         if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2132                                 if (!m_ops || !m_ops->slave_changelink)
2133                                         return -EOPNOTSUPP;
2134
2135                                 err = m_ops->slave_changelink(master_dev, dev,
2136                                                               tb, slave_data);
2137                                 if (err < 0)
2138                                         return err;
2139                                 status |= DO_SETLINK_NOTIFY;
2140                         }
2141
2142                         return do_setlink(skb, dev, ifm, tb, ifname, status);
2143                 }
2144
2145                 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2146                         if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2147                                 return rtnl_group_changelink(skb, net,
2148                                                 nla_get_u32(tb[IFLA_GROUP]),
2149                                                 ifm, tb);
2150                         return -ENODEV;
2151                 }
2152
2153                 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
2154                         return -EOPNOTSUPP;
2155
2156                 if (!ops) {
2157 #ifdef CONFIG_MODULES
2158                         if (kind[0]) {
2159                                 __rtnl_unlock();
2160                                 request_module("rtnl-link-%s", kind);
2161                                 rtnl_lock();
2162                                 ops = rtnl_link_ops_get(kind);
2163                                 if (ops)
2164                                         goto replay;
2165                         }
2166 #endif
2167                         return -EOPNOTSUPP;
2168                 }
2169
2170                 if (!ops->setup)
2171                         return -EOPNOTSUPP;
2172
2173                 if (!ifname[0]) {
2174                         snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
2175                         name_assign_type = NET_NAME_ENUM;
2176                 }
2177
2178                 dest_net = rtnl_link_get_net(net, tb);
2179                 if (IS_ERR(dest_net))
2180                         return PTR_ERR(dest_net);
2181
2182                 err = -EPERM;
2183                 if (!netlink_ns_capable(skb, dest_net->user_ns, CAP_NET_ADMIN))
2184                         goto out;
2185
2186                 if (tb[IFLA_LINK_NETNSID]) {
2187                         int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
2188
2189                         link_net = get_net_ns_by_id(dest_net, id);
2190                         if (!link_net) {
2191                                 err =  -EINVAL;
2192                                 goto out;
2193                         }
2194                         err = -EPERM;
2195                         if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
2196                                 goto out;
2197                 }
2198
2199                 dev = rtnl_create_link(link_net ? : dest_net, ifname,
2200                                        name_assign_type, ops, tb);
2201                 if (IS_ERR(dev)) {
2202                         err = PTR_ERR(dev);
2203                         goto out;
2204                 }
2205
2206                 dev->ifindex = ifm->ifi_index;
2207
2208                 if (ops->newlink) {
2209                         err = ops->newlink(link_net ? : net, dev, tb, data);
2210                         /* Drivers should call free_netdev() in ->destructor
2211                          * and unregister it on failure after registration
2212                          * so that device could be finally freed in rtnl_unlock.
2213                          */
2214                         if (err < 0) {
2215                                 /* If device is not registered at all, free it now */
2216                                 if (dev->reg_state == NETREG_UNINITIALIZED)
2217                                         free_netdev(dev);
2218                                 goto out;
2219                         }
2220                 } else {
2221                         err = register_netdevice(dev);
2222                         if (err < 0) {
2223                                 free_netdev(dev);
2224                                 goto out;
2225                         }
2226                 }
2227                 err = rtnl_configure_link(dev, ifm);
2228                 if (err < 0)
2229                         goto out_unregister;
2230                 if (link_net) {
2231                         err = dev_change_net_namespace(dev, dest_net, ifname);
2232                         if (err < 0)
2233                                 goto out_unregister;
2234                 }
2235 out:
2236                 if (link_net)
2237                         put_net(link_net);
2238                 put_net(dest_net);
2239                 return err;
2240 out_unregister:
2241                 if (ops->newlink) {
2242                         LIST_HEAD(list_kill);
2243
2244                         ops->dellink(dev, &list_kill);
2245                         unregister_netdevice_many(&list_kill);
2246                 } else {
2247                         unregister_netdevice(dev);
2248                 }
2249                 goto out;
2250         }
2251 }
2252
2253 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
2254 {
2255         struct net *net = sock_net(skb->sk);
2256         struct ifinfomsg *ifm;
2257         char ifname[IFNAMSIZ];
2258         struct nlattr *tb[IFLA_MAX+1];
2259         struct net_device *dev = NULL;
2260         struct sk_buff *nskb;
2261         int err;
2262         u32 ext_filter_mask = 0;
2263
2264         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
2265         if (err < 0)
2266                 return err;
2267
2268         if (tb[IFLA_IFNAME])
2269                 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2270
2271         if (tb[IFLA_EXT_MASK])
2272                 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2273
2274         ifm = nlmsg_data(nlh);
2275         if (ifm->ifi_index > 0)
2276                 dev = __dev_get_by_index(net, ifm->ifi_index);
2277         else if (tb[IFLA_IFNAME])
2278                 dev = __dev_get_by_name(net, ifname);
2279         else
2280                 return -EINVAL;
2281
2282         if (dev == NULL)
2283                 return -ENODEV;
2284
2285         nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
2286         if (nskb == NULL)
2287                 return -ENOBUFS;
2288
2289         err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).portid,
2290                                nlh->nlmsg_seq, 0, 0, ext_filter_mask);
2291         if (err < 0) {
2292                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
2293                 WARN_ON(err == -EMSGSIZE);
2294                 kfree_skb(nskb);
2295         } else
2296                 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
2297
2298         return err;
2299 }
2300
2301 static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
2302 {
2303         struct net *net = sock_net(skb->sk);
2304         struct net_device *dev;
2305         struct nlattr *tb[IFLA_MAX+1];
2306         u32 ext_filter_mask = 0;
2307         u16 min_ifinfo_dump_size = 0;
2308         int hdrlen;
2309
2310         /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
2311         hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2312                  sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2313
2314         if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy) >= 0) {
2315                 if (tb[IFLA_EXT_MASK])
2316                         ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
2317         }
2318
2319         if (!ext_filter_mask)
2320                 return NLMSG_GOODSIZE;
2321         /*
2322          * traverse the list of net devices and compute the minimum
2323          * buffer size based upon the filter mask.
2324          */
2325         list_for_each_entry(dev, &net->dev_base_head, dev_list) {
2326                 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
2327                                              if_nlmsg_size(dev,
2328                                                            ext_filter_mask));
2329         }
2330
2331         return min_ifinfo_dump_size;
2332 }
2333
2334 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
2335 {
2336         int idx;
2337         int s_idx = cb->family;
2338
2339         if (s_idx == 0)
2340                 s_idx = 1;
2341         for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
2342                 int type = cb->nlh->nlmsg_type-RTM_BASE;
2343                 if (idx < s_idx || idx == PF_PACKET)
2344                         continue;
2345                 if (rtnl_msg_handlers[idx] == NULL ||
2346                     rtnl_msg_handlers[idx][type].dumpit == NULL)
2347                         continue;
2348                 if (idx > s_idx) {
2349                         memset(&cb->args[0], 0, sizeof(cb->args));
2350                         cb->prev_seq = 0;
2351                         cb->seq = 0;
2352                 }
2353                 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
2354                         break;
2355         }
2356         cb->family = idx;
2357
2358         return skb->len;
2359 }
2360
2361 struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
2362                                        unsigned int change, gfp_t flags)
2363 {
2364         struct net *net = dev_net(dev);
2365         struct sk_buff *skb;
2366         int err = -ENOBUFS;
2367         size_t if_info_size;
2368
2369         skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
2370         if (skb == NULL)
2371                 goto errout;
2372
2373         err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0, 0);
2374         if (err < 0) {
2375                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
2376                 WARN_ON(err == -EMSGSIZE);
2377                 kfree_skb(skb);
2378                 goto errout;
2379         }
2380         return skb;
2381 errout:
2382         if (err < 0)
2383                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
2384         return NULL;
2385 }
2386
2387 void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
2388 {
2389         struct net *net = dev_net(dev);
2390
2391         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
2392 }
2393
2394 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
2395                   gfp_t flags)
2396 {
2397         struct sk_buff *skb;
2398
2399         skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
2400         if (skb)
2401                 rtmsg_ifinfo_send(skb, dev, flags);
2402 }
2403 EXPORT_SYMBOL(rtmsg_ifinfo);
2404
2405 static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
2406                                    struct net_device *dev,
2407                                    u8 *addr, u32 pid, u32 seq,
2408                                    int type, unsigned int flags,
2409                                    int nlflags)
2410 {
2411         struct nlmsghdr *nlh;
2412         struct ndmsg *ndm;
2413
2414         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
2415         if (!nlh)
2416                 return -EMSGSIZE;
2417
2418         ndm = nlmsg_data(nlh);
2419         ndm->ndm_family  = AF_BRIDGE;
2420         ndm->ndm_pad1    = 0;
2421         ndm->ndm_pad2    = 0;
2422         ndm->ndm_flags   = flags;
2423         ndm->ndm_type    = 0;
2424         ndm->ndm_ifindex = dev->ifindex;
2425         ndm->ndm_state   = NUD_PERMANENT;
2426
2427         if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
2428                 goto nla_put_failure;
2429
2430         nlmsg_end(skb, nlh);
2431         return 0;
2432
2433 nla_put_failure:
2434         nlmsg_cancel(skb, nlh);
2435         return -EMSGSIZE;
2436 }
2437
2438 static inline size_t rtnl_fdb_nlmsg_size(void)
2439 {
2440         return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN);
2441 }
2442
2443 static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, int type)
2444 {
2445         struct net *net = dev_net(dev);
2446         struct sk_buff *skb;
2447         int err = -ENOBUFS;
2448
2449         skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
2450         if (!skb)
2451                 goto errout;
2452
2453         err = nlmsg_populate_fdb_fill(skb, dev, addr, 0, 0, type, NTF_SELF, 0);
2454         if (err < 0) {
2455                 kfree_skb(skb);
2456                 goto errout;
2457         }
2458
2459         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
2460         return;
2461 errout:
2462         rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
2463 }
2464
2465 /**
2466  * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
2467  */
2468 int ndo_dflt_fdb_add(struct ndmsg *ndm,
2469                      struct nlattr *tb[],
2470                      struct net_device *dev,
2471                      const unsigned char *addr, u16 vid,
2472                      u16 flags)
2473 {
2474         int err = -EINVAL;
2475
2476         /* If aging addresses are supported device will need to
2477          * implement its own handler for this.
2478          */
2479         if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
2480                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2481                 return err;
2482         }
2483
2484         if (vid) {
2485                 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
2486                 return err;
2487         }
2488
2489         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2490                 err = dev_uc_add_excl(dev, addr);
2491         else if (is_multicast_ether_addr(addr))
2492                 err = dev_mc_add_excl(dev, addr);
2493
2494         /* Only return duplicate errors if NLM_F_EXCL is set */
2495         if (err == -EEXIST && !(flags & NLM_F_EXCL))
2496                 err = 0;
2497
2498         return err;
2499 }
2500 EXPORT_SYMBOL(ndo_dflt_fdb_add);
2501
2502 static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid)
2503 {
2504         u16 vid = 0;
2505
2506         if (vlan_attr) {
2507                 if (nla_len(vlan_attr) != sizeof(u16)) {
2508                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan\n");
2509                         return -EINVAL;
2510                 }
2511
2512                 vid = nla_get_u16(vlan_attr);
2513
2514                 if (!vid || vid >= VLAN_VID_MASK) {
2515                         pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id %d\n",
2516                                 vid);
2517                         return -EINVAL;
2518                 }
2519         }
2520         *p_vid = vid;
2521         return 0;
2522 }
2523
2524 static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
2525 {
2526         struct net *net = sock_net(skb->sk);
2527         struct ndmsg *ndm;
2528         struct nlattr *tb[NDA_MAX+1];
2529         struct net_device *dev;
2530         u8 *addr;
2531         u16 vid;
2532         int err;
2533
2534         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2535         if (err < 0)
2536                 return err;
2537
2538         ndm = nlmsg_data(nlh);
2539         if (ndm->ndm_ifindex == 0) {
2540                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid ifindex\n");
2541                 return -EINVAL;
2542         }
2543
2544         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2545         if (dev == NULL) {
2546                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex\n");
2547                 return -ENODEV;
2548         }
2549
2550         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2551                 pr_info("PF_BRIDGE: RTM_NEWNEIGH with invalid address\n");
2552                 return -EINVAL;
2553         }
2554
2555         addr = nla_data(tb[NDA_LLADDR]);
2556
2557         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2558         if (err)
2559                 return err;
2560
2561         err = -EOPNOTSUPP;
2562
2563         /* Support fdb on master device the net/bridge default case */
2564         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2565             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2566                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2567                 const struct net_device_ops *ops = br_dev->netdev_ops;
2568
2569                 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
2570                                        nlh->nlmsg_flags);
2571                 if (err)
2572                         goto out;
2573                 else
2574                         ndm->ndm_flags &= ~NTF_MASTER;
2575         }
2576
2577         /* Embedded bridge, macvlan, and any other device support */
2578         if ((ndm->ndm_flags & NTF_SELF)) {
2579                 if (dev->netdev_ops->ndo_fdb_add)
2580                         err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
2581                                                            vid,
2582                                                            nlh->nlmsg_flags);
2583                 else
2584                         err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
2585                                                nlh->nlmsg_flags);
2586
2587                 if (!err) {
2588                         rtnl_fdb_notify(dev, addr, RTM_NEWNEIGH);
2589                         ndm->ndm_flags &= ~NTF_SELF;
2590                 }
2591         }
2592 out:
2593         return err;
2594 }
2595
2596 /**
2597  * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
2598  */
2599 int ndo_dflt_fdb_del(struct ndmsg *ndm,
2600                      struct nlattr *tb[],
2601                      struct net_device *dev,
2602                      const unsigned char *addr, u16 vid)
2603 {
2604         int err = -EINVAL;
2605
2606         /* If aging addresses are supported device will need to
2607          * implement its own handler for this.
2608          */
2609         if (!(ndm->ndm_state & NUD_PERMANENT)) {
2610                 pr_info("%s: FDB only supports static addresses\n", dev->name);
2611                 return err;
2612         }
2613
2614         if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
2615                 err = dev_uc_del(dev, addr);
2616         else if (is_multicast_ether_addr(addr))
2617                 err = dev_mc_del(dev, addr);
2618
2619         return err;
2620 }
2621 EXPORT_SYMBOL(ndo_dflt_fdb_del);
2622
2623 static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
2624 {
2625         struct net *net = sock_net(skb->sk);
2626         struct ndmsg *ndm;
2627         struct nlattr *tb[NDA_MAX+1];
2628         struct net_device *dev;
2629         int err = -EINVAL;
2630         __u8 *addr;
2631         u16 vid;
2632
2633         if (!netlink_capable(skb, CAP_NET_ADMIN))
2634                 return -EPERM;
2635
2636         err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);
2637         if (err < 0)
2638                 return err;
2639
2640         ndm = nlmsg_data(nlh);
2641         if (ndm->ndm_ifindex == 0) {
2642                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid ifindex\n");
2643                 return -EINVAL;
2644         }
2645
2646         dev = __dev_get_by_index(net, ndm->ndm_ifindex);
2647         if (dev == NULL) {
2648                 pr_info("PF_BRIDGE: RTM_DELNEIGH with unknown ifindex\n");
2649                 return -ENODEV;
2650         }
2651
2652         if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
2653                 pr_info("PF_BRIDGE: RTM_DELNEIGH with invalid address\n");
2654                 return -EINVAL;
2655         }
2656
2657         addr = nla_data(tb[NDA_LLADDR]);
2658
2659         err = fdb_vid_parse(tb[NDA_VLAN], &vid);
2660         if (err)
2661                 return err;
2662
2663         err = -EOPNOTSUPP;
2664
2665         /* Support fdb on master device the net/bridge default case */
2666         if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
2667             (dev->priv_flags & IFF_BRIDGE_PORT)) {
2668                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2669                 const struct net_device_ops *ops = br_dev->netdev_ops;
2670
2671                 if (ops->ndo_fdb_del)
2672                         err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
2673
2674                 if (err)
2675                         goto out;
2676                 else
2677                         ndm->ndm_flags &= ~NTF_MASTER;
2678         }
2679
2680         /* Embedded bridge, macvlan, and any other device support */
2681         if (ndm->ndm_flags & NTF_SELF) {
2682                 if (dev->netdev_ops->ndo_fdb_del)
2683                         err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
2684                                                            vid);
2685                 else
2686                         err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
2687
2688                 if (!err) {
2689                         rtnl_fdb_notify(dev, addr, RTM_DELNEIGH);
2690                         ndm->ndm_flags &= ~NTF_SELF;
2691                 }
2692         }
2693 out:
2694         return err;
2695 }
2696
2697 static int nlmsg_populate_fdb(struct sk_buff *skb,
2698                               struct netlink_callback *cb,
2699                               struct net_device *dev,
2700                               int *idx,
2701                               struct netdev_hw_addr_list *list)
2702 {
2703         struct netdev_hw_addr *ha;
2704         int err;
2705         u32 portid, seq;
2706
2707         portid = NETLINK_CB(cb->skb).portid;
2708         seq = cb->nlh->nlmsg_seq;
2709
2710         list_for_each_entry(ha, &list->list, list) {
2711                 if (*idx < cb->args[0])
2712                         goto skip;
2713
2714                 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr,
2715                                               portid, seq,
2716                                               RTM_NEWNEIGH, NTF_SELF,
2717                                               NLM_F_MULTI);
2718                 if (err < 0)
2719                         return err;
2720 skip:
2721                 *idx += 1;
2722         }
2723         return 0;
2724 }
2725
2726 /**
2727  * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
2728  * @nlh: netlink message header
2729  * @dev: netdevice
2730  *
2731  * Default netdevice operation to dump the existing unicast address list.
2732  * Returns number of addresses from list put in skb.
2733  */
2734 int ndo_dflt_fdb_dump(struct sk_buff *skb,
2735                       struct netlink_callback *cb,
2736                       struct net_device *dev,
2737                       struct net_device *filter_dev,
2738                       int idx)
2739 {
2740         int err;
2741
2742         netif_addr_lock_bh(dev);
2743         err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
2744         if (err)
2745                 goto out;
2746         nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
2747 out:
2748         netif_addr_unlock_bh(dev);
2749         return idx;
2750 }
2751 EXPORT_SYMBOL(ndo_dflt_fdb_dump);
2752
2753 static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
2754 {
2755         struct net_device *dev;
2756         struct nlattr *tb[IFLA_MAX+1];
2757         struct net_device *bdev = NULL;
2758         struct net_device *br_dev = NULL;
2759         const struct net_device_ops *ops = NULL;
2760         const struct net_device_ops *cops = NULL;
2761         struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
2762         struct net *net = sock_net(skb->sk);
2763         int brport_idx = 0;
2764         int br_idx = 0;
2765         int idx = 0;
2766
2767         if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
2768                         ifla_policy) == 0) {
2769                 if (tb[IFLA_MASTER])
2770                         br_idx = nla_get_u32(tb[IFLA_MASTER]);
2771         }
2772
2773         brport_idx = ifm->ifi_index;
2774
2775         if (br_idx) {
2776                 br_dev = __dev_get_by_index(net, br_idx);
2777                 if (!br_dev)
2778                         return -ENODEV;
2779
2780                 ops = br_dev->netdev_ops;
2781                 bdev = br_dev;
2782         }
2783
2784         for_each_netdev(net, dev) {
2785                 if (brport_idx && (dev->ifindex != brport_idx))
2786                         continue;
2787
2788                 if (!br_idx) { /* user did not specify a specific bridge */
2789                         if (dev->priv_flags & IFF_BRIDGE_PORT) {
2790                                 br_dev = netdev_master_upper_dev_get(dev);
2791                                 cops = br_dev->netdev_ops;
2792                         }
2793
2794                         bdev = dev;
2795                 } else {
2796                         if (dev != br_dev &&
2797                             !(dev->priv_flags & IFF_BRIDGE_PORT))
2798                                 continue;
2799
2800                         if (br_dev != netdev_master_upper_dev_get(dev) &&
2801                             !(dev->priv_flags & IFF_EBRIDGE))
2802                                 continue;
2803
2804                         bdev = br_dev;
2805                         cops = ops;
2806                 }
2807
2808                 if (dev->priv_flags & IFF_BRIDGE_PORT) {
2809                         if (cops && cops->ndo_fdb_dump)
2810                                 idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
2811                                                          idx);
2812                 }
2813
2814                 if (dev->netdev_ops->ndo_fdb_dump)
2815                         idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
2816                                                             idx);
2817                 else
2818                         idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
2819
2820                 cops = NULL;
2821         }
2822
2823         cb->args[0] = idx;
2824         return skb->len;
2825 }
2826
2827 static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
2828                                unsigned int attrnum, unsigned int flag)
2829 {
2830         if (mask & flag)
2831                 return nla_put_u8(skb, attrnum, !!(flags & flag));
2832         return 0;
2833 }
2834
2835 int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
2836                             struct net_device *dev, u16 mode,
2837                             u32 flags, u32 mask)
2838 {
2839         struct nlmsghdr *nlh;
2840         struct ifinfomsg *ifm;
2841         struct nlattr *br_afspec;
2842         struct nlattr *protinfo;
2843         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
2844         struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2845
2846         nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), NLM_F_MULTI);
2847         if (nlh == NULL)
2848                 return -EMSGSIZE;
2849
2850         ifm = nlmsg_data(nlh);
2851         ifm->ifi_family = AF_BRIDGE;
2852         ifm->__ifi_pad = 0;
2853         ifm->ifi_type = dev->type;
2854         ifm->ifi_index = dev->ifindex;
2855         ifm->ifi_flags = dev_get_flags(dev);
2856         ifm->ifi_change = 0;
2857
2858
2859         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
2860             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
2861             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
2862             (br_dev &&
2863              nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
2864             (dev->addr_len &&
2865              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
2866             (dev->ifindex != dev_get_iflink(dev) &&
2867              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
2868                 goto nla_put_failure;
2869
2870         br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
2871         if (!br_afspec)
2872                 goto nla_put_failure;
2873
2874         if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
2875                 nla_nest_cancel(skb, br_afspec);
2876                 goto nla_put_failure;
2877         }
2878
2879         if (mode != BRIDGE_MODE_UNDEF) {
2880                 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
2881                         nla_nest_cancel(skb, br_afspec);
2882                         goto nla_put_failure;
2883                 }
2884         }
2885         nla_nest_end(skb, br_afspec);
2886
2887         protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
2888         if (!protinfo)
2889                 goto nla_put_failure;
2890
2891         if (brport_nla_put_flag(skb, flags, mask,
2892                                 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
2893             brport_nla_put_flag(skb, flags, mask,
2894                                 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
2895             brport_nla_put_flag(skb, flags, mask,
2896                                 IFLA_BRPORT_FAST_LEAVE,
2897                                 BR_MULTICAST_FAST_LEAVE) ||
2898             brport_nla_put_flag(skb, flags, mask,
2899                                 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
2900             brport_nla_put_flag(skb, flags, mask,
2901                                 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
2902             brport_nla_put_flag(skb, flags, mask,
2903                                 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
2904             brport_nla_put_flag(skb, flags, mask,
2905                                 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
2906             brport_nla_put_flag(skb, flags, mask,
2907                                 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
2908                 nla_nest_cancel(skb, protinfo);
2909                 goto nla_put_failure;
2910         }
2911
2912         nla_nest_end(skb, protinfo);
2913
2914         nlmsg_end(skb, nlh);
2915         return 0;
2916 nla_put_failure:
2917         nlmsg_cancel(skb, nlh);
2918         return -EMSGSIZE;
2919 }
2920 EXPORT_SYMBOL(ndo_dflt_bridge_getlink);
2921
2922 static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
2923 {
2924         struct net *net = sock_net(skb->sk);
2925         struct net_device *dev;
2926         int idx = 0;
2927         u32 portid = NETLINK_CB(cb->skb).portid;
2928         u32 seq = cb->nlh->nlmsg_seq;
2929         u32 filter_mask = 0;
2930
2931         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
2932                 struct nlattr *extfilt;
2933
2934                 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
2935                                           IFLA_EXT_MASK);
2936                 if (extfilt) {
2937                         if (nla_len(extfilt) < sizeof(filter_mask))
2938                                 return -EINVAL;
2939
2940                         filter_mask = nla_get_u32(extfilt);
2941                 }
2942         }
2943
2944         rcu_read_lock();
2945         for_each_netdev_rcu(net, dev) {
2946                 const struct net_device_ops *ops = dev->netdev_ops;
2947                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
2948
2949                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
2950                         if (idx >= cb->args[0] &&
2951                             br_dev->netdev_ops->ndo_bridge_getlink(
2952                                     skb, portid, seq, dev, filter_mask) < 0)
2953                                 break;
2954                         idx++;
2955                 }
2956
2957                 if (ops->ndo_bridge_getlink) {
2958                         if (idx >= cb->args[0] &&
2959                             ops->ndo_bridge_getlink(skb, portid, seq, dev,
2960                                                     filter_mask) < 0)
2961                                 break;
2962                         idx++;
2963                 }
2964         }
2965         rcu_read_unlock();
2966         cb->args[0] = idx;
2967
2968         return skb->len;
2969 }
2970
2971 static inline size_t bridge_nlmsg_size(void)
2972 {
2973         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
2974                 + nla_total_size(IFNAMSIZ)      /* IFLA_IFNAME */
2975                 + nla_total_size(MAX_ADDR_LEN)  /* IFLA_ADDRESS */
2976                 + nla_total_size(sizeof(u32))   /* IFLA_MASTER */
2977                 + nla_total_size(sizeof(u32))   /* IFLA_MTU */
2978                 + nla_total_size(sizeof(u32))   /* IFLA_LINK */
2979                 + nla_total_size(sizeof(u32))   /* IFLA_OPERSTATE */
2980                 + nla_total_size(sizeof(u8))    /* IFLA_PROTINFO */
2981                 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
2982                 + nla_total_size(sizeof(u16))   /* IFLA_BRIDGE_FLAGS */
2983                 + nla_total_size(sizeof(u16));  /* IFLA_BRIDGE_MODE */
2984 }
2985
2986 static int rtnl_bridge_notify(struct net_device *dev)
2987 {
2988         struct net *net = dev_net(dev);
2989         struct sk_buff *skb;
2990         int err = -EOPNOTSUPP;
2991
2992         if (!dev->netdev_ops->ndo_bridge_getlink)
2993                 return 0;
2994
2995         skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
2996         if (!skb) {
2997                 err = -ENOMEM;
2998                 goto errout;
2999         }
3000
3001         err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
3002         if (err < 0)
3003                 goto errout;
3004
3005         if (!skb->len)
3006                 goto errout;
3007
3008         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3009         return 0;
3010 errout:
3011         WARN_ON(err == -EMSGSIZE);
3012         kfree_skb(skb);
3013         if (err)
3014                 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3015         return err;
3016 }
3017
3018 static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
3019 {
3020         struct net *net = sock_net(skb->sk);
3021         struct ifinfomsg *ifm;
3022         struct net_device *dev;
3023         struct nlattr *br_spec, *attr = NULL;
3024         int rem, err = -EOPNOTSUPP;
3025         u16 flags = 0;
3026         bool have_flags = false;
3027
3028         if (nlmsg_len(nlh) < sizeof(*ifm))
3029                 return -EINVAL;
3030
3031         ifm = nlmsg_data(nlh);
3032         if (ifm->ifi_family != AF_BRIDGE)
3033                 return -EPFNOSUPPORT;
3034
3035         dev = __dev_get_by_index(net, ifm->ifi_index);
3036         if (!dev) {
3037                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3038                 return -ENODEV;
3039         }
3040
3041         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3042         if (br_spec) {
3043                 nla_for_each_nested(attr, br_spec, rem) {
3044                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3045                                 if (nla_len(attr) < sizeof(flags))
3046                                         return -EINVAL;
3047
3048                                 have_flags = true;
3049                                 flags = nla_get_u16(attr);
3050                                 break;
3051                         }
3052                 }
3053         }
3054
3055         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3056                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3057
3058                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
3059                         err = -EOPNOTSUPP;
3060                         goto out;
3061                 }
3062
3063                 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
3064                 if (err)
3065                         goto out;
3066
3067                 flags &= ~BRIDGE_FLAGS_MASTER;
3068         }
3069
3070         if ((flags & BRIDGE_FLAGS_SELF)) {
3071                 if (!dev->netdev_ops->ndo_bridge_setlink)
3072                         err = -EOPNOTSUPP;
3073                 else
3074                         err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
3075                                                                   flags);
3076                 if (!err) {
3077                         flags &= ~BRIDGE_FLAGS_SELF;
3078
3079                         /* Generate event to notify upper layer of bridge
3080                          * change
3081                          */
3082                         err = rtnl_bridge_notify(dev);
3083                 }
3084         }
3085
3086         if (have_flags)
3087                 memcpy(nla_data(attr), &flags, sizeof(flags));
3088 out:
3089         return err;
3090 }
3091
3092 static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
3093 {
3094         struct net *net = sock_net(skb->sk);
3095         struct ifinfomsg *ifm;
3096         struct net_device *dev;
3097         struct nlattr *br_spec, *attr = NULL;
3098         int rem, err = -EOPNOTSUPP;
3099         u16 flags = 0;
3100         bool have_flags = false;
3101
3102         if (nlmsg_len(nlh) < sizeof(*ifm))
3103                 return -EINVAL;
3104
3105         ifm = nlmsg_data(nlh);
3106         if (ifm->ifi_family != AF_BRIDGE)
3107                 return -EPFNOSUPPORT;
3108
3109         dev = __dev_get_by_index(net, ifm->ifi_index);
3110         if (!dev) {
3111                 pr_info("PF_BRIDGE: RTM_SETLINK with unknown ifindex\n");
3112                 return -ENODEV;
3113         }
3114
3115         br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
3116         if (br_spec) {
3117                 nla_for_each_nested(attr, br_spec, rem) {
3118                         if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
3119                                 if (nla_len(attr) < sizeof(flags))
3120                                         return -EINVAL;
3121
3122                                 have_flags = true;
3123                                 flags = nla_get_u16(attr);
3124                                 break;
3125                         }
3126                 }
3127         }
3128
3129         if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
3130                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3131
3132                 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
3133                         err = -EOPNOTSUPP;
3134                         goto out;
3135                 }
3136
3137                 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
3138                 if (err)
3139                         goto out;
3140
3141                 flags &= ~BRIDGE_FLAGS_MASTER;
3142         }
3143
3144         if ((flags & BRIDGE_FLAGS_SELF)) {
3145                 if (!dev->netdev_ops->ndo_bridge_dellink)
3146                         err = -EOPNOTSUPP;
3147                 else
3148                         err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
3149                                                                   flags);
3150
3151                 if (!err) {
3152                         flags &= ~BRIDGE_FLAGS_SELF;
3153
3154                         /* Generate event to notify upper layer of bridge
3155                          * change
3156                          */
3157                         err = rtnl_bridge_notify(dev);
3158                 }
3159         }
3160
3161         if (have_flags)
3162                 memcpy(nla_data(attr), &flags, sizeof(flags));
3163 out:
3164         return err;
3165 }
3166
3167 /* Process one rtnetlink message. */
3168
3169 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
3170 {
3171         struct net *net = sock_net(skb->sk);
3172         rtnl_doit_func doit;
3173         int sz_idx, kind;
3174         int family;
3175         int type;
3176         int err;
3177
3178         type = nlh->nlmsg_type;
3179         if (type > RTM_MAX)
3180                 return -EOPNOTSUPP;
3181
3182         type -= RTM_BASE;
3183
3184         /* All the messages must have at least 1 byte length */
3185         if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
3186                 return 0;
3187
3188         family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
3189         sz_idx = type>>2;
3190         kind = type&3;
3191
3192         if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
3193                 return -EPERM;
3194
3195         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
3196                 struct sock *rtnl;
3197                 rtnl_dumpit_func dumpit;
3198                 rtnl_calcit_func calcit;
3199                 u16 min_dump_alloc = 0;
3200
3201                 dumpit = rtnl_get_dumpit(family, type);
3202                 if (dumpit == NULL)
3203                         return -EOPNOTSUPP;
3204                 calcit = rtnl_get_calcit(family, type);
3205                 if (calcit)
3206                         min_dump_alloc = calcit(skb, nlh);
3207
3208                 __rtnl_unlock();
3209                 rtnl = net->rtnl;
3210                 {
3211                         struct netlink_dump_control c = {
3212                                 .dump           = dumpit,
3213                                 .min_dump_alloc = min_dump_alloc,
3214                         };
3215                         err = netlink_dump_start(rtnl, skb, nlh, &c);
3216                 }
3217                 rtnl_lock();
3218                 return err;
3219         }
3220
3221         doit = rtnl_get_doit(family, type);
3222         if (doit == NULL)
3223                 return -EOPNOTSUPP;
3224
3225         return doit(skb, nlh);
3226 }
3227
3228 static void rtnetlink_rcv(struct sk_buff *skb)
3229 {
3230         rtnl_lock();
3231         netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
3232         rtnl_unlock();
3233 }
3234
3235 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
3236 {
3237         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3238
3239         switch (event) {
3240         case NETDEV_UP:
3241         case NETDEV_DOWN:
3242         case NETDEV_PRE_UP:
3243         case NETDEV_POST_INIT:
3244         case NETDEV_REGISTER:
3245         case NETDEV_CHANGE:
3246         case NETDEV_PRE_TYPE_CHANGE:
3247         case NETDEV_GOING_DOWN:
3248         case NETDEV_UNREGISTER:
3249         case NETDEV_UNREGISTER_FINAL:
3250         case NETDEV_RELEASE:
3251         case NETDEV_JOIN:
3252         case NETDEV_BONDING_INFO:
3253                 break;
3254         default:
3255                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
3256                 break;
3257         }
3258         return NOTIFY_DONE;
3259 }
3260
3261 static struct notifier_block rtnetlink_dev_notifier = {
3262         .notifier_call  = rtnetlink_event,
3263 };
3264
3265
3266 static int __net_init rtnetlink_net_init(struct net *net)
3267 {
3268         struct sock *sk;
3269         struct netlink_kernel_cfg cfg = {
3270                 .groups         = RTNLGRP_MAX,
3271                 .input          = rtnetlink_rcv,
3272                 .cb_mutex       = &rtnl_mutex,
3273                 .flags          = NL_CFG_F_NONROOT_RECV,
3274         };
3275
3276         sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
3277         if (!sk)
3278                 return -ENOMEM;
3279         net->rtnl = sk;
3280         return 0;
3281 }
3282
3283 static void __net_exit rtnetlink_net_exit(struct net *net)
3284 {
3285         netlink_kernel_release(net->rtnl);
3286         net->rtnl = NULL;
3287 }
3288
3289 static struct pernet_operations rtnetlink_net_ops = {
3290         .init = rtnetlink_net_init,
3291         .exit = rtnetlink_net_exit,
3292 };
3293
3294 void __init rtnetlink_init(void)
3295 {
3296         if (register_pernet_subsys(&rtnetlink_net_ops))
3297                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
3298
3299         register_netdevice_notifier(&rtnetlink_dev_notifier);
3300
3301         rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
3302                       rtnl_dump_ifinfo, rtnl_calcit);
3303         rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
3304         rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
3305         rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
3306
3307         rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
3308         rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
3309
3310         rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, NULL);
3311         rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, NULL);
3312         rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, NULL);
3313
3314         rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, NULL);
3315         rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, NULL);
3316         rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, NULL);
3317 }
3318